how to pass selected value of dropdown to ajax autocomplete textbox

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C#2.0

C#

hi,
i am doing search through using ajax autocomplete in that i got one dropdown..I want to pass selected value of dropdown to a webservice..here my code is..plz anyone help regard this issue

public string[] GetCountry(string prefixText)
 {

     //Retieve connection string from config file and assigned in to the sqlconnection
     SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);
     SqlCommand sqlcmd = new SqlCommand();
     DataSet ds = new DataSet();
     //write query to get country name based on user entered text
     string query = "select  Name from hospital_hospitaladd where Name like '" + prefixText + "%' ";
     sqlcmd = new SqlCommand(query, sqlcon);
     sqlcon.Open();
     SqlDataAdapter da = new SqlDataAdapter();
     da.SelectCommand = sqlcmd;
     da.Fill(ds);
     //Create one array variable and set size based on return datatable row count
     string[] cname = new string[ds.Tables[0].Rows.Count];
     //string[] category = new string[ds.Tables[0].Rows.Count];
     int i = 0;
     try
     {
         foreach (DataRow dr in ds.Tables[0].Rows)
         {
             //assign each value in to the array variable
             cname.SetValue(dr["Name"].ToString(), i);
             //cname.SetValue(dr["category"].ToString(), i);
             i++;
         }
     }
     catch (Exception ex)
     {
     }
     finally
     {
         sqlcon.Close();
     }
     //Lastreturn that array values for bind in extender
     return cname;
 }

regards,
Manohar